Emplacement
any
Mass (weight)
controller 180g, socket 50g,
AGK accessories 12 g.
Commands in the event of operational interference
Stray light/premature ignition
During pre-purge and/or pre-ignition there should be no flamesignal. If
there is a flame signal, eg from premature ignition due to a faulty solenoid,
external light, short circuit in the photoresisto or wiring, malfunction in the
flame signal amplifier, etc., at the end of pre-purge and safety time the
controller locks out the burner and stops the fuel flow even during safety
time.
Absence of flame
If there is no flame at the end of safety time the controller locks out imme-
diately.
Absence of flame during operation
If there is no flame during operation the controller cuts off the supply of
fuel and automatically initiates a fresh start-up programme: at the end of
t4 the start-up programme ends.
Whenever there is a safety stop, terminals 3-8 and 11 are de-energised in
less than 1 second; at the same time a remote lockout signal is transmit-
ted through terminal 10. The controller can be reset after c. 50 seconds.
SIEMENS OIL BURNERS AUTOMATIC CONTROLLER SIEMENS
LMO14 - LMO24 - LMO44
The LMO... burner controls are designed for the start-up and supervision
of single- or 2-stage forced draught oil burners in intermittent operation.
Yellow-burning flames are supervised with photoresistive detectors
QRB..., blue-burning flames with blue-flame detectors QRC...
In terms of housing dimensions, electrical connections and flame
detectors, the LMO... are identical to the LOA... oil burner controls.
Preconditions for startup
z
Burner control is reset
z
All contacts in the line are closed
z
No undervoltage
z
Flame detector is darkened, no extraneous light
Undervoltage
z
Safety shut-down in the operating position takes place should the
mains voltage drop below about AC 165 V
z
Restart is initiated when the mains voltage exceeds about
AC 175 V
Time supervision oil pre-heater
If the oil pre-heater’s release contact does not close within 10 minutes,
the burner control will initiate lock-out.
Controlled intermittent operation
After no more than 24 hours of continuous operation, the burner control
will initiate an automatic safety shut-down followed by a restart.
Control sequence in the event of fault
If lock-out occurs, the outputs for the fuel valves and the ignition will
immediately be deactivated (< 1 second).
Lock-out
In the event of lock-out, the LMO... remains locked (lock-out cannot be
changed), and the red signal lamp will light up. This status is also maintai-
ned in the case of a mains failure.
Resetting the burner
Whenever lock-out occurs, the burner control can immediately be reset.
To do this, keep control the lock-out reset button depressed for about 1
second (< 3 seconds).
Ignition program with LMO24.113A2
If the flame is lost during «TSA», the burner will be reignited, but not later
than at the end of «TSAmax.». This means that several ignition attempts
can be made during TSA (refer to «Program sequence»).
Limitation of repetitions
If the flame is lost during operation, a maximum of 3 repetitions can be
made. If the flame is lost for the 4th time during operation, the burner will
initiate lock-out. The repetition count is restarted each time controlled
switching on by «R-W-SB» takes place.
Operation
Lock-out reset button «EK...» is the key operating element for
resetting the burner control and for activating / deactivating the
diagnostic functions.
Cause
Response
After a mains failure
Restart
After voltage has fallen below the
undervoltage threshold
Restart
In the event of a premature, faulty
flame signal during «t1»
Lock-out at the end of «t1»
In the event of a premature, faulty
flame signal during «tw»
Prevention of start-up, lock-
out after no more than 40
seconds
If the burner does not ignite during
«TSA»
Lock-out at the end of TSA
In the event the flame is lost during
operation
Max. 3 repetitions, followed
by lock-out
Oil pre-heater’s release contact does
not close within 10 min.
Lock-out
E K
